360 Bore

moper said

.030 is listed IIRC as maximum fatory allowable on anything newer than 1980. .040 is no big deal for stock and mild builds. If you plan to make more than 400hp, or really work it (pulling/towing, racing, whatever, then .030 is always the safest bet. 318s can go .090 if they pass sonic. You'll never see a factory 360 block that can go safely to .090. Different casting cores=different thicknesses. smaller than .020 may be hard to find pistons for too. .030 is normal.

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I am considering to purchase a 360 block that has been bored 060. over for my 68 Dart; and you mentioned something about "IIRC" and maximum factory allowable on the bore for any block newer than 1980 to be .040.

I've read a book by "Jim Szilagyi" (How to build Big Inch Mopar small blocks) and he stated on page 17, something about "any block after 1975 were made lighter to improve fuel economy. And that this change effected the cylinder bore on the water jacket side. Plus to have the block "Sonically checked" could provide more information.

What or who is IIRC, and where did you find the information about 1980 blocks ? I'm new at this engine stuff, and I want to be absolute sure before I purchase this 360. Thanks